[clang] [llvm] [OMPIRBuilder] Replace getAllocatedType with careful tracking (PR #181845)

[Tom Eccles via cfe-commits]

tblah wrote:

Please take a look at the failing tests
```
2026-02-17T16:05:56.5765501Z Failed Tests (3):
2026-02-17T16:05:56.5765723Z   MLIR :: Target/LLVMIR/omptarget-llvm.mlir
2026-02-17T16:05:56.5766019Z   MLIR :: Target/LLVMIR/omptarget-nowait-llvm.mlir
2026-02-17T16:05:56.5766324Z   MLIR :: Target/LLVMIR/omptarget-nowait.mlir
```

https://github.com/llvm/llvm-project/pull/181845